Electronic Components Datasheet Search
  English  ▼
ALLDATASHEET.COM

X  

OPA381AIDGKR Datasheet(PDF) 10 Page - Texas Instruments

Click here to check the latest version.
Part # OPA381AIDGKR
Description  Precision, Low Power, 18MHz Transimpedance Amplifier
Download  24 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

OPA381AIDGKR Datasheet(HTML) 10 Page - Texas Instruments

Back Button OPA381AIDGKR Datasheet HTML 6Page - Texas Instruments OPA381AIDGKR Datasheet HTML 7Page - Texas Instruments OPA381AIDGKR Datasheet HTML 8Page - Texas Instruments OPA381AIDGKR Datasheet HTML 9Page - Texas Instruments OPA381AIDGKR Datasheet HTML 10Page - Texas Instruments OPA381AIDGKR Datasheet HTML 11Page - Texas Instruments OPA381AIDGKR Datasheet HTML 12Page - Texas Instruments OPA381AIDGKR Datasheet HTML 13Page - Texas Instruments OPA381AIDGKR Datasheet HTML 14Page - Texas Instruments Next Button
Zoom Inzoom in Zoom Outzoom out
 10 / 24 page
background image
OPA381
OPA2381
SBOS313B − AUGUST 2004 − REVISED NOVEMBER 2004
www.ti.com
10
BIASING PHOTODIODES IN SINGLE-SUPPLY
CIRCUITS
The +IN input can be biased with a positive DC voltage
to offset the output voltage and allow the amplifier
output to indicate a true zero photodiode measurement
when the photodiode is not exposed to any light. It will
also prevent the added delay that results from coming
out of the negative rail. This bias voltage appears
across the photodiode, providing a reverse bias for
faster operation. An RC filter placed at this bias point will
reduce noise. (Refer to Figure 4.) This bias voltage can
also serve as an offset bias point for an ADC with range
that does not include ground.
OPA381
V
OUT =IDRF +VBIAS
100k
V+
R
F
10M
I
D
C
F
(1)
< 1pF
0.1
µF
λ
NOTE: (1) C
F is optional to prevent gain peaking.
It includes the stray capacitance of R
F.
+V
BIAS
[0V to (V+)
− 1.8V]
Figure 4. Photodiode with Filtered Reverse Bias
Voltage
TRANSIMPEDANCE AMPLIFIER
Wide bandwidth, low input bias current and low input
voltage and current noise make the OPA381 an ideal
wideband photodiode transimpedance amplifier. Low
voltage noise
is
important
because
photodiode
capacitance causes the effective noise gain of the
circuit to increase at high frequency.
The key elements to a transimpedance design are
shown in Figure 5:
D the total input capacitance (CTOT), consisting of the
photodiode capacitance (CDIODE) plus the parasitic
common-mode
and
differential-mode
input
capacitance (2.5pF + 1pF for the OPA381);
D the desired transimpedance gain (RF);
D the Gain Bandwidth Product (GBW) for the
OPA381 (18MHz).
With these three variables set, the feedback capacitor
value (CF) can be set to control the frequency response.
CSTRAY is the stray capacitance of RF, which is 0.2pF for
a typical surface-mount resistor.
To achieve a maximally flat 2nd-order Butterworth
frequency response, the feedback pole should be set
to:
1
2
pR
F CF
) C
STRAY
+
GBW
4
pR
FCTOT
Bandwidth is calculated by:
f*3dB +
GBW
2
pR
FCTOT
Hz
These
equations
will
result
in
maximum
transimpedance
bandwidth.
For
even
higher
transimpedance bandwidth, the high-speed CMOS
OPA380 (90MHz GBW), the OPA300 (150MHz GBW),
or the OPA656 (230MHz GBW) may be used.
For additional information, refer to Application Bulletin
AB−050 (SBOA055), Compensate Transimpedance
Amplifiers
Intuitively,
available
for
download
at
www.ti.com.
C
TOT
(3)
OPA381
V
OUT
−5V
10M
+5V
R
F
C
F
(1)
C
STRAY
(2)
λ
NOTE: (1) C
F is optional to prevent gain peaking.
(2) C
STRAY is the stray capacitance of RF
(typically, 0.2pF for a surface−mount resistor).
(3) C
TOT is the photodiode capacitance plus OPA381
input capacitance.
R
P (optional
pulldown resistor)
Figure 5. Transimpedance Amplifier
(1)
(2)


Similar Part No. - OPA381AIDGKR

ManufacturerPart #DatasheetDescription
logo
Burr-Brown (TI)
OPA381AIDGKR BURR-BROWN-OPA381AIDGKR Datasheet
489Kb / 19P
   Precision, Low Power, 18MHz Transimpedance Amplifier
More results

Similar Description - OPA381AIDGKR

ManufacturerPart #DatasheetDescription
logo
Burr-Brown (TI)
OPA2381 BURR-BROWN-OPA2381 Datasheet
489Kb / 19P
   Precision, Low Power, 18MHz Transimpedance Amplifier
logo
NXP Semiconductors
SA5222 PHILIPS-SA5222 Datasheet
80Kb / 8P
   Low-power FDDI transimpedance amplifier
1995 Apr 26
logo
Burr-Brown (TI)
IVC102 BURR-BROWN-IVC102 Datasheet
124Kb / 10P
   PRECISION SWITCHED INTEGRATOR TRANSIMPEDANCE AMPLIFIER
logo
Texas Instruments
IVC102 TI1-IVC102 Datasheet
664Kb / 15P
[Old version datasheet]   PRECISION SWITCHED INTEGRATOR TRANSIMPEDANCE AMPLIFIER
logo
Burr-Brown (TI)
OPA380 BURR-BROWN-OPA380 Datasheet
362Kb / 18P
   Precision, High-Speed Transimpedance Amplifier
logo
Texas Instruments
OPA380AID TI-OPA380AID Datasheet
695Kb / 22P
[Old version datasheet]   Precision, High-Speed Transimpedance Amplifier
logo
Maxim Integrated Produc...
MAX3271 MAXIM-MAX3271 Datasheet
558Kb / 8P
   3.3V, 2.5Gbps Low-Power Transimpedance Amplifier
Rev 0; 7/01
MAX3657 MAXIM-MAX3657_V01 Datasheet
755Kb / 15P
   155Mbps Low-Noise Transimpedance Amplifier
19-2834; Rev 3; 11/05
logo
SIRENZA MICRODEVICES
SFT-0100 SIRENZA-SFT-0100 Datasheet
162Kb / 4P
   Transimpedance Amplifier
logo
Maxim Integrated Produc...
MAX3657 MAXIM-MAX3657 Datasheet
433Kb / 15P
   155Mbps Low-Noise Transimpedance Amplifier
Rev 2; 2/04
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24


Datasheet Download

Go To PDF Page


Link URL




Privacy Policy
ALLDATASHEET.COM
Does ALLDATASHEET help your business so far?  [ DONATE ] 

About Alldatasheet   |   Advertisement   |   Datasheet Upload   |   Contact us   |   Privacy Policy   |   Link Exchange   |   Manufacturer List
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com